fix: 修正拼写错误并添加升级动画播放逻辑

- 将 `palayBuff` 方法名更正为 `playBuff`
- 在英雄升级时调用 `playAllTime` 方法播放"plus"动画
- 确保动画播放方法在参数为空时安全返回

assets/script/game/hero/Hero.ts

@@ -87,6 +87,8 @@ export class Hero extends ecs.Entity {
         mLogger.log(this.debugMode,"hero",node.getSiblingIndex());
 
         var hv = node.getComponent(HeroViewComp)!;
+        if(hero_lv >1){hv.playAllTime("plus")}
+
         const model = this.get(HeroAttrsComp);
         // 从配置中读取英雄静态数据
         let hero = HeroInfo[uuid];